/*
 * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * This software is open source.
 * See the bottom of this file for the licence.
 */

package com.googlecode.bluetools.dom4j.xpath;

import java.util.ArrayList;

import org.jaxen.Context;
import org.jaxen.ContextSupport;
import org.jaxen.JaxenException;
import org.jaxen.SimpleNamespaceContext;
import org.jaxen.SimpleVariableContext;
import org.jaxen.VariableContext;
import org.jaxen.XPathFunctionContext;
import org.jaxen.dom4j.DocumentNavigator;
import org.jaxen.pattern.Pattern;
import org.jaxen.pattern.PatternParser;
import org.jaxen.saxpath.SAXPathException;

import com.googlecode.bluetools.dom4j.InvalidXPathException;
import com.googlecode.bluetools.dom4j.Node;
import com.googlecode.bluetools.dom4j.XPathException;

/**
 * <p>
 * <code>XPathPattern</code> is an implementation of Pattern which uses an XPath xpath.
 * </p>
 * 
 * @author <a href="mailto:jstrachan@apache.org">James Strachan </a>
 * @version $Revision: 1.1 $
 */
public class XPathPattern implements com.googlecode.bluetools.dom4j.rule.Pattern {
	private String text;

	private Pattern pattern;

	private Context context;

	public XPathPattern(Pattern pattern) {
		this.pattern = pattern;
		this.text = pattern.getText();
		this.context = new Context(getContextSupport());
	}

	public XPathPattern(String text) {
		this.text = text;
		this.context = new Context(getContextSupport());

		try {
			this.pattern = PatternParser.parse(text);
		}
		catch (SAXPathException e) {
			throw new InvalidXPathException(text, e.getMessage());
		}
		catch (Throwable t) {
			throw new InvalidXPathException(text, t);
		}
	}

	public boolean matches(Node node) {
		try {
			ArrayList list = new ArrayList(1);
			list.add(node);
			context.setNodeSet(list);

			return pattern.matches(node, context);
		}
		catch (JaxenException e) {
			handleJaxenException(e);

			return false;
		}
	}

	public String getText() {
		return text;
	}

	public double getPriority() {
		return pattern.getPriority();
	}

	public com.googlecode.bluetools.dom4j.rule.Pattern[] getUnionPatterns() {
		Pattern[] patterns = pattern.getUnionPatterns();

		if (patterns != null) {
			int size = patterns.length;
			XPathPattern[] answer = new XPathPattern[size];

			for (int i = 0; i < size; i++) {
				answer[i] = new XPathPattern(patterns[i]);
			}

			return answer;
		}

		return null;
	}

	public short getMatchType() {
		return pattern.getMatchType();
	}

	public String getMatchesNodeName() {
		return pattern.getMatchesNodeName();
	}

	public void setVariableContext(VariableContext variableContext) {
		context.getContextSupport().setVariableContext(variableContext);
	}

	public String toString() {
		return "[XPathPattern: text: " + text + " Pattern: " + pattern + "]";
	}

	protected ContextSupport getContextSupport() {
		return new ContextSupport(new SimpleNamespaceContext(), XPathFunctionContext.getInstance(),
				new SimpleVariableContext(), DocumentNavigator.getInstance());
	}

	protected void handleJaxenException(JaxenException exception) throws XPathException {
		throw new XPathException(text, exception);
	}
}

/*
 * Redistribution and use of this software and associated documentation ("Software"), with or without modification, are
 * permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain copyright statements and notices. Redistributions must also contain a
 * copy of this document.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
 * following disclaimer in the documentation and/or other materials provided with the distribution.
 * 
 * 3. The name "DOM4J" must not be used to endorse or promote products derived from this Software without prior written
 * permission of MetaStuff, Ltd. For written permission, please contact dom4j-info@metastuff.com.
 * 
 * 4. Products derived from this Software may not be called "DOM4J" nor may "DOM4J" appear in their names without prior
 * written permission of MetaStuff, Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
 * 
 * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
 * 
 * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
 */
